Liquid purifying filters



c. W. HULSBERGEN LIQUID PURIFYING FILTERS Filed April 1.4, 1953 UnitedStates Patent LIQUID PURIFYING FILTERS Cornelis Wichert Hulsbergen, TheHague, Netherlands Application April 14, 1953, Serial No. 348,644

3 Claims. (Cl. 210-171) For use in a liquid purifying filter, filter bedflushing means have been proposed, comprising a series of flushingnozzles each screwed into a sleeve embedded in a nozzle floor and eachhaving associated with it a plunge tube downwardly extending from saidsleeve into the space below said nozzle floor, said nozzle having radialoutlet slots and being composed of two equally and similarly shapedcircular sections each carrying a series of axially extending uniformlyspaced projections or teeth along their outer circumference such teethtapering towards their free end and being so dimensioned, that uponassembling said sections by inter-engaging said axial teeth, gaps orslots are left between the side faces of said interengaging teeth.

This known construction is particularly designed to provide a nozzleconsisting of two identical nozzle sections enabling such nozzle to beeasily and inexpensively manufactured particularly when pressmouldedfrom glass or synthetic materials.

In this known structure, however, the depth to which the teeth of onesection should enter the gaps between the teeth of the other section sothat the outlet slots are of the required width, is determined by anumber of axially cooperating stops arranged inside or outside saidseries of teeth and all or in part also tangentially cooperating. Thismeans that when assembling the nozzle sections by axially inter-engagingthe two series of teeth, special care has to be given to the relativeangular position of such nozzle sections, to assure the correct axialcoincidence of said stops, as otherwise the slots between the successiveinter-engaging teeth disappear.

In connection therewith the present invention has for its object toprovide means enabling the nozzle sections to be correctly assembledregardless of the attentiveness or skill of the operator.

To this end, according to the present invention, the projections of bothnozzle sections are locally enlarged particularly at their tips or rootsor both, and to such an extent, that in assembling the two sections, thetips of the teeth of one section are jammed between the roots of thoseof the other section and thus the desired width of the slots isautomatically obtained. It is therefore unimportant in what relativeangular positions the two nozzle sections are assembled.

The invention will hereinafter be further described with reference tothe accompanying drawings, in which:

Figure 1 is a side elevational view of an assembled nozzle according tothe present invention and mounted in a nozzle floor of a liquidpurifying filter, the respective portion of such floor being shown incross-section.

Figure 2 is a plan view of such nozzle.

Figure 3 is an exploded sectional view of the various components of thenozzle structure according to the invention and Figure 4 shows the uppernozzle section seen from below.

Referring to these figures, Figure 1 shows the improved nozzle structurein operative position in a nozzle floor 2,770,369 Patented Nov. 13, 1956and screwed into the internally threaded upper portion of a sleevetraversing said nozzle floor and having arranged therein a downwardlyprojecting plunge tube held in position in said sleeve by the clampingaction of a ring of rubber or the like resilient material surroundingsaid tube and being confined in a downwardly tapering chamber formed inthe lower portion of said sleeve, all as described in my copending U. S.patent application Serial Number 192,027, filed October 25, 1950, nowPatent No. 2,711,829.

As more particularly shown in Figures 3 and 4, according to the presentinvention, the nozzle proper consists of two equally and similarlyshaped sections 1 each comprising a circular series of axially extendingprojections in the form of truncated circular cones 2 having an enlargedroot portion 3, such cones being integrally formed with an annularcarrier 4 of which the centrally located opening 5 is defined by aportion 5 of a spherical surface. The enlarged root portions 3 of saidcones are so dimensioned that when, in assembling the two sections, thetips of the cones of one section are jammed between the enlarged rootportion 3 of those of the other section, the slots defined by themantels of the cones have exactly the required width.

A further component of the nozzle is formed by a specially designedscrew bolt 6 serving both for locking the two sets of cones ininter-engaged condition and for securing the nozzle in position in thenozzle floor.

This screw bolt 6 has a head 6' and a hollow stem 6 radially slotted toprovide lateral outlet passages 6 for the flushing agent, such stembeing provided with external screw threads 6 fitting the internal screwthreads 7 of the sleeve 7 which is embedded in the nozzle floor 8 andcontains the plunge tube 9 introduced from above, such tube being heldin place by the lateral clamping action of the resilient ring 10 asstated above.

By screwing the bolt 6 into the sleeve 7, as a result whereof the lowerface of the bolt stem 6 accurately adjusts the plunge tube 9 to therequired height, the nozzle constituted by the two inter-engaging seriesof cones 2 is rigidly secured between the upper face of the nozzle floor8 and the lower face of the head 6 of the screw bolt 6 which lower faceis shaped complementary to the wall 5 of the passage 5 of the uppercarrier 4, so that a centering and liquid tight connection is assured.The stream of flushing liquid or liquid and air, during the operation ofthe filter or the flushing of the filter bed passes through the centralplunger tube 9 and the hollow slotted stem 6 of the bolt 6, into theusual filter material (not shown) constituting the filter bed.

From the above it is clear that the present invention provides for anovel and efiicient flushing nozzle for use in the nozzle floor of aliquid purifying filter, which nozzle may be easily and inexpensivelymanufactured and may be readily assembled by unskilled persons withoutrequiring any special care as far as the relative angular position ofthe two nozzle sections during such assembling is concerned, the correctwidth of the outlet slots being obtained automatically in all relativeangular positions of the nozzle sections.

It is obvious that the local enlargement of the cones or otherprojections may also be located at the tip of such projections or evenboth at the tip and at the root thereof, the embodiment shown, however,being advantageous in view of the manufacturing and the assembling ofthe nozzle sections.

What I claim is:

1. A nozzle for use in liquid purifying filters comprising two identicalnozzle sections each having an annular base, a circular series ofoutwardly tapering elements integral with and axially projecting fromsaid base and uniformly spaced to an extent somewhat exceeding the widthof such elements, said nozzle sections being coaxi-ally assembled sothat the elements of one section interengage with some lateral clearancewith those of the other section, and means for locking said sections insaid relative position comprising at least one local enlargement on eachsaid element so dimensioned, that in coaxially assembling said nozzlesections, the tips of the elements of one section are jammed between theroots of the elements of the other section to thereby define the widthof the outlet slots formed by the lateral clearance of theinter-engaging elements.

2. A nozzle for use in liquid purifying filters comprising'two identicalnozzle sections each having an annular base, a circular series ofoutwardly tapering elements integral with and axially projecting fromsaid base and uniformly spaced to an extent somewhat exceeding the widthof such elements, said nozzle sections being coaxially assembled so thatthe elements of one section interengage with some lateral clearance withthose of the other section, and means for locking said sections in saidrelative position comprising a conical enlargement of the root portionof each element of both sections of such dimension that in coaxiallyassembling said nozzle sections, the tips of the elements of one sectionare jammed between the roots of the elements of the other section tothereby define the Width of the outlet slots formed by the lateralclearance of the inter-engaging elements.

3. A nozzle as claimed in claim 2 wherein the annular base of one of thesections defines a seating and said means for locking said sectionscomprises a first separate portion adapted to be inserted through theannular bases, said first separate portion having a threaded end and anend opposite thereto for engaging the seating, and a second separateportion for engaging the threaded end and defining a hollow stem with anecked down portion, said nozzle further comprising a tube inserted insaid hollow stem and resilient means therearound for supporting saidtube on said necked down portion, the threaded end of said firstseparate portion engaging an end of said tube whereby the position ofsaid tube is adjusted in accordance With the threaded engagement betweensaid first and second portions.

References Cited in the file of this patent Bakker Oct. 23, 1951

